When I try to add a custom error in IIS and use the url option it always gives me an error about using an absolute path... (this is in the properties > Custom Errors of the site in IIS)

I have tried all the folowing combinations of absolute & relative urls:

http://www.mysite.com/404.asp

mysite.com/404.asp

404.asp

../404.asp

./404.asp

and each time it will give the same error?